from collections import deque
N = int(input())
ans = []
L = [deque(list(map(int,input().split()))) for i in range(N)]
for i in range(N) :
    L[i].popleft()

flg = True
while flg :
    flg = False
    for i in range(len(L)) :
        if len(L[i]) :
            flg = True
            ans.append(L[i].popleft())
print(*ans)